Materiały źródłowe

• #1 Developmental Dysplasia of the Hip (DDH): Etiology, Diagnosis, and Management

  https://pmc.ncbi.nlm.nih.gov/articles/PMC10488138/

  Developmental dysplasia of the hip (DDH) is a complex disorder that refers to different hip problems, including neonatal instability, acetabular, or femoral dysplasia, hip subluxation, and hip dislocation. […] Despite identifying the risk factors, the exact aetiology and pathophysiology are still unclear. […] The optimal growth of the hip joint depends upon two main factors: first, the concentric reduction of femoral head, and second, adequate balance of growth between acetabular and triradiate cartilages. Any imbalance in these, whether during fetal development or postnatal growth, will result in abnormal hip development. The complex nature of this condition is due to a mix of genetic, environmental, and mechanical factors. Various etiological theories of DDH have been proposed in the literature, highlighting hormonal, mechanical, and genetic factors.

• #1 What Causes Hip Dysplasia? – International Hip Dysplasia Institute

  https://hipdysplasia.org/developmental-dysplasia-of-the-hip/causes-of-ddh/

  The exact cause or causes of hip dysplasia are not known. It is widely accepted that hip dysplasia develops around the time of birth because the hip socket is shallower at birth than at any time before or after birth. […] Hip dysplasia is approximately 12 times more likely when there is a family history. […] Genetics plays a role but is not a direct cause of hip dysplasia. […] The babys womb position can increase pressure on the hips. […] Babies in the breech position are more likely to have instability than babies in a normal womb position and have an increased risk of DDH. […] Babies with fixed foot deformity or stiffness in the neck (torticollis) have slightly increased risk of hip dysplasia. […] Some infants may be more sensitive to these hormones than others, allowing for excessive ligament laxity in the baby.

• #2 Developmental Dysplasia of the Hip – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK563157/

  Developmental dysplasia of the hip occurs due to an abnormal hip development, presenting in infancy or early childhood with a spectrum ranging from dysplasia to dislocation of the hip joint. […] The exact etiology is still elusive. Multifactorial in nature, a combination of genetic, environmental, and mechanical factors play a role. Many genetic loci have also been identified in familial cases. […] The following risk factors for developmental dysplasia of the hip have demonstrated an increased incidence of hip abnormalities, which should prompt clinicians to perform clinical screening, including: […] Female sex: There is a fourfold greater incidence in females than males. The increased incidence is likely due to ligamentous laxity from maternal hormones. […] Breech position: In the last trimester, breech position is the most significant risk factor for developmental dysplasia of the hip, with an odds ratio of 5.47.

• #2 Developmental Dysplasia of the Hip | AAFP

  https://www.aafp.org/pubs/afp/issues/2006/1015/p1310.html

  Developmental dysplasia of the hip refers to a continuum of abnormalities in the immature hip that can range from subtle dysplasia to dislocation. […] The incidence of DDH is variable and depends on many factors. Approximately one in 1,000 children is born with a dislocated hip, and 10 in 1,000 may have hip subluxation. Factors contributing to DDH include breech presentation, female sex, positive family history, firstborn status, and oligohydramnios. Intrauterine position, sex, race, and positive family history are the most important risk factors. […] A family history positive for DDH may be found in 12 to 33 percent of affected patients. The risk of DDH for a child has been documented at 6 percent when there is one affected sibling, 12 percent with one affected parent, and 36 percent if a parent and a sibling are affected.

• #3 Developmental Dysplasia of the Hip | AAFP

  https://www.aafp.org/pubs/afp/issues/2006/1015/p1310.html

  Developmental dysplasia of the hip refers to a continuum of abnormalities in the immature hip that can range from subtle dysplasia to dislocation. […] The incidence of DDH is variable and depends on many factors. Approximately one in 1,000 children is born with a dislocated hip, and 10 in 1,000 may have hip subluxation. Factors contributing to DDH include breech presentation, female sex, positive family history, firstborn status, and oligohydramnios. Intrauterine position, sex, race, and positive family history are the most important risk factors. […] A family history positive for DDH may be found in 12 to 33 percent of affected patients. The risk of DDH for a child has been documented at 6 percent when there is one affected sibling, 12 percent with one affected parent, and 36 percent if a parent and a sibling are affected.

• #4 Developmental Dysplasia of the Hip – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK563157/

  Family history: Many genes have been implicated in causing developmental dysplasia of the hip in the Asian population, including COL2A1, DKK1, HOXB9, HOXD9, and WISP3. […] Swaddling: Swaddling infants in the adducted and extended position may increase the incidence of developmental dysplasia of the hip in specific populations, including Native American, Japanese, and Turkish infants. […] In utero restriction: Any physical limitation within the uterus can contribute to developmental dysplasia of the hip. […] Postterm gestation: Postmaturity is a risk factor for developmental dysplasia of the hip.

• #5 What Causes Hip Dysplasia? – International Hip Dysplasia Institute

  https://hipdysplasia.org/developmental-dysplasia-of-the-hip/causes-of-ddh/

  The exact cause or causes of hip dysplasia are not known. It is widely accepted that hip dysplasia develops around the time of birth because the hip socket is shallower at birth than at any time before or after birth. […] Hip dysplasia is approximately 12 times more likely when there is a family history. […] Genetics plays a role but is not a direct cause of hip dysplasia. […] The babys womb position can increase pressure on the hips. […] Babies in the breech position are more likely to have instability than babies in a normal womb position and have an increased risk of DDH. […] Babies with fixed foot deformity or stiffness in the neck (torticollis) have slightly increased risk of hip dysplasia. […] Some infants may be more sensitive to these hormones than others, allowing for excessive ligament laxity in the baby.

• #6 Developmental Dysplasia of the Hip (DDH): Etiology, Diagnosis, and Management

  https://pmc.ncbi.nlm.nih.gov/articles/PMC10488138/

  The hormonal theory has a significant role in hip dysplasia development. It is based on an imbalanced ratio of estrogen to progesterone. A progesterone-rich environment can promote dislocation, whereas an estrogen-rich environment can inhibit it. […] The mechanical factors are usually related to restricted space in utero resulting in fetal packaging deformities. This could be seen in the first baby. The baby may be growing inside a horn of a bicornuate uterus where there is limited space. If the baby is relatively large, there may be a subsequent packaging deformity. […] One of the most important mechanical factors that may be a risk for DDH is breech presentation at birth. A 25% risk of DDH exists for neonates born after being in the breech position. About 30 to 50% of patients with DDH have a history of breech delivery.

• #7 Understanding Hip Dysplasia in Babies: Causes, Symptoms and Treatment

  https://www.telebaby.com.au/articles/understanding-hip-dysplasia-babies-causes-symptoms-treatment

  Hormonal Factors: Around the time of birth, the mother makes hormones that allow the mothers ligaments to become lax (stretch easier) so that the baby can pass through the birth canal. Some infants may be more sensitive to these hormones than others, allowing for excessive ligament laxity in the baby thus leading to hip dysplasia. […] Underlying neuromuscular disorders such as cerebral palsy. […] Incorrect positioning of the baby’s hips during the first few months of life can increase the risk of hip dysplasia. Swaddling the legs tightly together or prolonged positioning in a baby carrier that does not support the hips properly may hinder normal hip joint development. […] Various factors, including genetics, environment, hormonal imbalances, and improper positioning, can contribute to the development of hip dysplasia.

• #8 What Causes Hip Dysplasia? – International Hip Dysplasia Institute

  https://hipdysplasia.org/developmental-dysplasia-of-the-hip/causes-of-ddh/

  Girls usually have more ligament laxity than boys and girls are 4-5 times more likely to have hip dysplasia than boys. […] The bones of an infants hip joint are much softer than an adult hip joint. […] Culture that keep infants hips extended on a cradleboard or papoose board have high rates of hip dysplasia in their children. Cultures that hold infants with the hips apart have very low rates of hip dysplasia.

• #9 Developmental Dysplasia of the Hip | AAFP

  https://www.aafp.org/pubs/afp/issues/2006/1015/p1310.html

  Eighty percent of children with DDH are females. This is postulated to be related to the effects of additional estrogen produced by the female fetus, which increases ligamentous laxity. […] DDH occurs more often in children who present in the breech position. It is believed that in utero knee extension of the infant in the breech position results in sustained hamstring forces around the hip and contributes to subsequent hip instability. […] In utero postural deformities and oligohydramnios also are associated with DDH. For unknown reasons, DDH is less common in black persons. […] The postnatal extrauterine environment also plays a role in DDH. The incidence of DDH is high in Native American cultures that use swaddling, which forces the hips into adduction and extension.

• #10 Developmental Dysplasia of the Hip (DDH): Etiology, Diagnosis, and Management

  https://pmc.ncbi.nlm.nih.gov/articles/PMC10488138/

  The hormonal theory has a significant role in hip dysplasia development. It is based on an imbalanced ratio of estrogen to progesterone. A progesterone-rich environment can promote dislocation, whereas an estrogen-rich environment can inhibit it. […] The mechanical factors are usually related to restricted space in utero resulting in fetal packaging deformities. This could be seen in the first baby. The baby may be growing inside a horn of a bicornuate uterus where there is limited space. If the baby is relatively large, there may be a subsequent packaging deformity. […] One of the most important mechanical factors that may be a risk for DDH is breech presentation at birth. A 25% risk of DDH exists for neonates born after being in the breech position. About 30 to 50% of patients with DDH have a history of breech delivery.

• #11 Developmental Dysplasia of the Hip | AAFP

  https://www.aafp.org/pubs/afp/issues/2006/1015/p1310.html

  Eighty percent of children with DDH are females. This is postulated to be related to the effects of additional estrogen produced by the female fetus, which increases ligamentous laxity. […] DDH occurs more often in children who present in the breech position. It is believed that in utero knee extension of the infant in the breech position results in sustained hamstring forces around the hip and contributes to subsequent hip instability. […] In utero postural deformities and oligohydramnios also are associated with DDH. For unknown reasons, DDH is less common in black persons. […] The postnatal extrauterine environment also plays a role in DDH. The incidence of DDH is high in Native American cultures that use swaddling, which forces the hips into adduction and extension.

• #12 Developmental Dysplasia of the Hip (DDH): Etiology, Diagnosis, and Management

  https://pmc.ncbi.nlm.nih.gov/articles/PMC10488138/

  The hormonal theory has a significant role in hip dysplasia development. It is based on an imbalanced ratio of estrogen to progesterone. A progesterone-rich environment can promote dislocation, whereas an estrogen-rich environment can inhibit it. […] The mechanical factors are usually related to restricted space in utero resulting in fetal packaging deformities. This could be seen in the first baby. The baby may be growing inside a horn of a bicornuate uterus where there is limited space. If the baby is relatively large, there may be a subsequent packaging deformity. […] One of the most important mechanical factors that may be a risk for DDH is breech presentation at birth. A 25% risk of DDH exists for neonates born after being in the breech position. About 30 to 50% of patients with DDH have a history of breech delivery.

• #13 Developmental Dysplasia of the Hip (DDH): Etiology, Diagnosis, and Management

  https://pmc.ncbi.nlm.nih.gov/articles/PMC10488138/

  The hormonal theory has a significant role in hip dysplasia development. It is based on an imbalanced ratio of estrogen to progesterone. A progesterone-rich environment can promote dislocation, whereas an estrogen-rich environment can inhibit it. […] The mechanical factors are usually related to restricted space in utero resulting in fetal packaging deformities. This could be seen in the first baby. The baby may be growing inside a horn of a bicornuate uterus where there is limited space. If the baby is relatively large, there may be a subsequent packaging deformity. […] One of the most important mechanical factors that may be a risk for DDH is breech presentation at birth. A 25% risk of DDH exists for neonates born after being in the breech position. About 30 to 50% of patients with DDH have a history of breech delivery.

• #14 Developmental Dysplasia of the Hip | AAFP

  https://www.aafp.org/pubs/afp/issues/2006/1015/p1310.html

  Eighty percent of children with DDH are females. This is postulated to be related to the effects of additional estrogen produced by the female fetus, which increases ligamentous laxity. […] DDH occurs more often in children who present in the breech position. It is believed that in utero knee extension of the infant in the breech position results in sustained hamstring forces around the hip and contributes to subsequent hip instability. […] In utero postural deformities and oligohydramnios also are associated with DDH. For unknown reasons, DDH is less common in black persons. […] The postnatal extrauterine environment also plays a role in DDH. The incidence of DDH is high in Native American cultures that use swaddling, which forces the hips into adduction and extension.

• #15 Hip dysplasia – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/hip-dysplasia/symptoms-causes/syc-20350209

  Hip dysplasia is the medical term for a hip socket that doesn’t fully cover the ball portion of the upper thighbone. This allows the hip joint to become partially or completely dislocated. Most people with hip dysplasia are born with the condition. […] At birth, the hip joint is made of soft cartilage that gradually hardens into bone. The ball and socket need to fit together well because they act as molds for each other. If the ball isn’t seated firmly into the socket, the socket will not fully form around the ball and will become too shallow. […] During the final month before birth, the space within the womb can become so crowded that the ball of the hip joint moves out of its proper position. This results in a shallower socket. Factors that may reduce the amount of space in the womb include: First pregnancy, Large baby, Breech presentation. […] Hip dysplasia tends to run in families and is more common in girls. The risk of hip dysplasia is also higher in babies born in the breech position and in babies who are swaddled tightly with the hips and knees straight.

• #16 Hip Dysplasia in Children: Causes, Symptoms and Treatment

  https://www.nationwidechildrens.org/family-resources-education/700childrens/2017/08/hip-dysplasia-in-children-causes-symptoms-and-treatment

  DDH can occur due to several mechanical, hormonal, genetic and environmental factors. […] Firstborn females carry the highest risk for DDH as the uterus is typically smaller with firstborns, resulting in limited room for movement. […] A breech delivery or a baby’s response to the mother’s hormones during pregnancy may play a role in DDH. […] After birth, DDH can occur if an infant is held with extended and adducted hips while swaddled.

• #17 Hip dysplasia – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/hip-dysplasia/symptoms-causes/syc-20350209

  Hip dysplasia is the medical term for a hip socket that doesn’t fully cover the ball portion of the upper thighbone. This allows the hip joint to become partially or completely dislocated. Most people with hip dysplasia are born with the condition. […] At birth, the hip joint is made of soft cartilage that gradually hardens into bone. The ball and socket need to fit together well because they act as molds for each other. If the ball isn’t seated firmly into the socket, the socket will not fully form around the ball and will become too shallow. […] During the final month before birth, the space within the womb can become so crowded that the ball of the hip joint moves out of its proper position. This results in a shallower socket. Factors that may reduce the amount of space in the womb include: First pregnancy, Large baby, Breech presentation. […] Hip dysplasia tends to run in families and is more common in girls. The risk of hip dysplasia is also higher in babies born in the breech position and in babies who are swaddled tightly with the hips and knees straight.

• #18

  https://www.parkwayeast.com.sg/conditions-diseases/developmental-hip-dysplasia/symptoms-causes

  Hip dysplasia refers to insufficient coverage of the acetabulum (socket) over the femoral head (ball). […] Right before birth, the womb can become so crowded that it can cause the ball of a baby’s hip joint to move out of its proper position. As newborn’s hip joint is made up of soft cartilage which hardens into bone after birth, if the ball of the bone does not fit well together with the hip socket, the socket will not form fully around the ball. This results in a shallower socket and an unstable hip. […] Factors that may affect the amount of space in the womb include: Breech presentation, First pregnancy, Large baby, Restriction in the uterus, when the space within the womb becomes crowded. […] Contributing factors include: Low levels of amniotic fluid in the womb, Breech presentation, when the baby is born hips first, A family history of the condition as CHD tends to run in families and is more common in girls, Babies who are swaddled tightly with straightened hips and knees.

• #19 Hip Dysplasia: What is it and how is it treated?

  https://www.webmd.com/children/what-is-hip-dysplasia

  Hip dysplasia can run in families and it happens more often in girls than boys. It shows up in babies because the hip joint is made of soft cartilage when youre born. Over time, it hardens into bone. […] The ball and socket help mold each other during this time, so if the ball isnt fitting properly into the socket, the socket may end up too shallow and not form completely over the ball. […] There are a few reasons this can happen right before a baby is born: Its the mothers first pregnancy. The baby is large. Or there is oligohydramnios, a condition in which there is too little amniotic fluid in the sac that the baby has lived in throughout the pregnancy, which limits the baby’s movement. The baby is in the breech position — meaning the rear, not the head, is toward the birth canal. […] All of these things can reduce the amount of space in the womb, which can make things crowded for the baby and move the ball out of its proper position. Swaddling babies with their hips and knees straight can also contribute to the condition.

• #20 Congenital Hip Dislocation: Causes, Symptoms, and Diagnosis

  https://www.healthline.com/health/developmental-dysplasia-of-the-hip

  Congenital hip dislocation (CHD) occurs when a child is born with an unstable hip. Its caused by abnormal formation of the hip joint during their early stages of fetal development. […] The cause of CHD is unknown in many cases. Contributing factors include low levels of amniotic fluid in the womb, breech presentation, which occurs when your baby is born hips first, and a family history of the condition. Confinement in the uterus may also cause CHD or contribute to it. […] You cant prevent CHD. Its important to bring your child to regular checkups so their doctor can identify and treat the condition as soon as possible. […] Complicated or invasive treatment is less likely to be necessary when your doctor identifies CHD early and your baby received treatment with a Pavlik harness. Its estimated that between 80 and 95 percent of cases identified early receive successful treatment, depending on the severity of the condition.

• #21

  https://www.shrinerschildrens.org/en/news-and-media/news/2021/12/displasia-de-cadera-causas-y-tratamiento

  What causes hip dysplasia? […] Hip dysplasia is known to be caused by several factors, and the genetic aspect is very relevant in this condition. […] This condition is caused by several factors, both due to genetic predisposition and due to intrinsic and extrinsic mechanical factors. […] Genetics: family inheritance. […] Mechanical: oligohydramnios (decreased amniotic fluid), first pregnancy, uterine abnormalities, breech presentation or sitting position. […] Cultural behavior: swaddling the baby with legs together as a taco. In this case, if the patient had incipient hip problems, this position causes the hips to come together and move out, thereby worsening the condition.

• #22 Hip Dysplasia – Symptoms and Causes | GetWellGo

  https://getwellgo.com/post/hip-dysplasia-symptoms-and-causes

  Some hip malformations can be hereditary and therefore contributes to the formation of dysplasia. […] The posture of the baby in the womb seems to have some role in the development of the hip joint of a new-born baby. […] Lack of room in the uterus, particularly when the baby presents in the breech position, which is when the babys feet or bottom is facing down in the womb, increases the risk of baby having hip dysplasia. […] It is characterized as low amniotic fluid levels in pregnant women that limit fetal motion and impede the growth of joints. […] The tight bundling of a baby or keeping babys legs straight might hinder natural crossing of the legs and can lead to DDH. […] Any kind of direct injury to the hip joint such as fracture-dislocation will adversely affect the hip joint and may lead to dysplasia or exacerbation of dysplasia.

• #23 Developmental dysplasia of the hip (DDH) | Better Health Channel

  https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/developmental-dysplasia-of-the-hip-ddh

  There are many causes of DDH, both genetic and environmental, including: […] family history around one third of babies with DDH have a blood relative who also had the condition […] congenital disorders DDH is more common in babies with disorders such as cerebral palsy and spina bifida […] breech delivery being born feet first can put considerable stress on the babys hip joints […] multiple babies crowding inside the womb may dislocate the hip […] first-time mother the inexperienced uterus and vagina may cause a difficult or prolonged delivery.

• #24 What Causes Developmental Hip Dysplasia in Babies? | Ivy Rehab

  https://ivyrehab.com/health-resources/pediatrics/what-causes-developmental-hip-dysplasia-in-babies/

  Developmental hip dysplasia is a condition of the hip where the hip joint does not develop properly. The hip is a ball and socket joint. The socket, also known as the acetabulum, is part of the pelvis. The ball, or femoral head, is part of the femur. When the femoral head does not sit perfectly in the acetabulum, it causes developmental dysplasia of the hip or DDH. […] Although the exact cause of hip dysplasia is unknown, several contributing factors are widely accepted. […] Genetics can play a role in hip dysplasia, but it’s not a direct cause. If a parent or a sibling has been diagnosed with hip dysplasia, that child’s chances of being diagnosed increase compared to a child who do not have a parent or sibling with that diagnosis. […] The position of a baby in the womb can place increased pressure on the hips, leading to the hip problem. Even in a normal position in the womb, more pressure is put on the left hip than the right, which might be a factor that contributes to the left hip being affected more often than the right. However, babies in the breech position are more at risk for hip instability and are more likely to be diagnosed with hip dysplasia. Additionally, if a child is a multiple, this puts them at greater risk of hip instability and hip dysplasia. The lack of room in the womb for movement, or poor positioning, can put added stress on the hips.

• #25 Developmental Dysplasia of the Hip (DDH): Etiology, Diagnosis, and Management

  https://pmc.ncbi.nlm.nih.gov/articles/PMC10488138/

  In a newborn infant, the normal hip posture is flexion and abduction. The maintenance of acetabulo-femoral contact promotes hip growth. Although the majority of AD identified in neonatal hip ultrasound recovers spontaneously, swaddling may promote deformity in infants. […] An inherited predisposition has been well-established in the literature. First-degree relatives have a 12 times greater risk of acquiring a DDH, but second-degree relationships have a relative risk of only 1.7 times. […] However, the majority of DDH patients and those who require treatment often do not exhibit any risk factors other than being female.

• #26 Developmental Dysplasia of the Hip – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK563157/

  Family history: Many genes have been implicated in causing developmental dysplasia of the hip in the Asian population, including COL2A1, DKK1, HOXB9, HOXD9, and WISP3. […] Swaddling: Swaddling infants in the adducted and extended position may increase the incidence of developmental dysplasia of the hip in specific populations, including Native American, Japanese, and Turkish infants. […] In utero restriction: Any physical limitation within the uterus can contribute to developmental dysplasia of the hip. […] Postterm gestation: Postmaturity is a risk factor for developmental dysplasia of the hip.

• #27 Hip dysplasia – Wikipedia

  https://en.wikipedia.org/wiki/Hip_dysplasia

  In the breech position the femoral head tends to get pushed out of the socket and the breech position is probably the most important single risk factor, whether an infant is delivered vaginally or by cesarean section. […] As an acquired condition it has been linked to traditions of swaddling infants, use of overly restrictive baby seats, carriers and other methods of transporting babies, or use of a cradle board which locks the hip joint in an „adducted” position (pulling the knees together tends to pull the heads of the femur bone out of the sockets or acetabulae) for extended periods.

• #28 What Causes Hip Dysplasia? – International Hip Dysplasia Institute

  https://hipdysplasia.org/developmental-dysplasia-of-the-hip/causes-of-ddh/

  Girls usually have more ligament laxity than boys and girls are 4-5 times more likely to have hip dysplasia than boys. […] The bones of an infants hip joint are much softer than an adult hip joint. […] Culture that keep infants hips extended on a cradleboard or papoose board have high rates of hip dysplasia in their children. Cultures that hold infants with the hips apart have very low rates of hip dysplasia.

• #29 Hip dysplasia – Wikipedia

  https://en.wikipedia.org/wiki/Hip_dysplasia

  In the breech position the femoral head tends to get pushed out of the socket and the breech position is probably the most important single risk factor, whether an infant is delivered vaginally or by cesarean section. […] As an acquired condition it has been linked to traditions of swaddling infants, use of overly restrictive baby seats, carriers and other methods of transporting babies, or use of a cradle board which locks the hip joint in an „adducted” position (pulling the knees together tends to pull the heads of the femur bone out of the sockets or acetabulae) for extended periods.

• #30 Hip Dysplasia | Boston Children’s Hospital

  https://www.childrenshospital.org/conditions/hip-dysplasia

  Hip dysplasia occurs when the hip joint has not developed properly and the socket (acetabulum) is too shallow. […] The exact cause is unknown, but doctors believe several factors increase a child’s risk of hip dysplasia: a family history of DDH in a parent or other close relative, gender (girls are two to four times more likely to have the condition), first-born babies, breech position during pregnancy, and tight swaddling with legs extended. […] Some teens and young adults are born with mild DDH that becomes symptomatic as they grow. However, the hip joint continues to develop throughout the teen years and sometimes does not develop properly, even if you were not born with DDH. […] Girls and women are two to four times more likely than boys to have hip dysplasia. It also tends to affect first-born children and those who have a close family member with hip problems. […] Hip dysplasia is sometimes confused with hip impingement, which occurs when extra bone grow on the acetabulum or femoral head.

• #31 Developmental Dysplasia of the Hip – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK563157/

  Developmental dysplasia of the hip occurs due to an abnormal hip development, presenting in infancy or early childhood with a spectrum ranging from dysplasia to dislocation of the hip joint. […] The exact etiology is still elusive. Multifactorial in nature, a combination of genetic, environmental, and mechanical factors play a role. Many genetic loci have also been identified in familial cases. […] The following risk factors for developmental dysplasia of the hip have demonstrated an increased incidence of hip abnormalities, which should prompt clinicians to perform clinical screening, including: […] Female sex: There is a fourfold greater incidence in females than males. The increased incidence is likely due to ligamentous laxity from maternal hormones. […] Breech position: In the last trimester, breech position is the most significant risk factor for developmental dysplasia of the hip, with an odds ratio of 5.47.

• #32 Hip Dysplasia

  https://www.massgeneral.org/orthopaedics/children/conditions-and-treatments/hip-dysplasia

  Developmental dysplasia of the hip (DDH) may occur during fetal development, at delivery, or after birth. […] The exact cause of DDH is unknown, but research has discovered several theories and risk factors for hip dysplasia. […] Anything that causes cramping or crowding of the fetus inside the uterus (large birth weight, oligohydramnios, decreased amniotic fluid) is thought to cause an increased incidence of DDH. […] More significant risk factors for DDH include female gender, first born babies, and babies born in the breech position. […] It is thought that there is a slightly higher incidence of DDH when other orthopaedic (torticollis, metatarsus adductus, clubfoot) or connective tissue disorders (Larsen syndrome) are present.

• #33 Hip Dysplasia – Symptoms and Causes | GetWellGo

  https://getwellgo.com/post/hip-dysplasia-symptoms-and-causes

  Repeated stress or trauma, such as the one experienced by athletes or those people who perform high impact activities regularly can also be a cause of acquired hip dysplasia particularly in the adulthood. […] Hip dysplasia is common in females than males; this may be cause by differences in structure of the pelvic region. […] Firstborn children are also more vulnerable; this could be attributed to the following reasons; that the pelvic space of the mother is narrow during childbirth. […] Hip dysplasia is also common among babies with low birth weight or those born preterm. […] Some diseases, for example, Ehlers-Danlos syndrome or Down syndrome that involve connective tissues pose the chances of joint instability including the hip dysplasia. […] Some of the conditions that are associated with hip dysplasia include cerebral palsy, spina bifida or any other diseases that affect muscles as well as bone growth.

• #34 Hip Dysplasia

  https://www.massgeneral.org/orthopaedics/children/conditions-and-treatments/hip-dysplasia

  Developmental dysplasia of the hip (DDH) may occur during fetal development, at delivery, or after birth. […] The exact cause of DDH is unknown, but research has discovered several theories and risk factors for hip dysplasia. […] Anything that causes cramping or crowding of the fetus inside the uterus (large birth weight, oligohydramnios, decreased amniotic fluid) is thought to cause an increased incidence of DDH. […] More significant risk factors for DDH include female gender, first born babies, and babies born in the breech position. […] It is thought that there is a slightly higher incidence of DDH when other orthopaedic (torticollis, metatarsus adductus, clubfoot) or connective tissue disorders (Larsen syndrome) are present.

• #35 Developmental dysplasia of the hip (DDH) | Better Health Channel

  https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/developmental-dysplasia-of-the-hip-ddh

  There are many causes of DDH, both genetic and environmental, including: […] family history around one third of babies with DDH have a blood relative who also had the condition […] congenital disorders DDH is more common in babies with disorders such as cerebral palsy and spina bifida […] breech delivery being born feet first can put considerable stress on the babys hip joints […] multiple babies crowding inside the womb may dislocate the hip […] first-time mother the inexperienced uterus and vagina may cause a difficult or prolonged delivery.

• #36 The Etiology of Neuromuscular Hip Dysplasia and Implications for Management: A Narrative Review

  https://www.mdpi.com/2227-9067/11/7/844

  This study summarizes the current knowledge of the etiology of hip dysplasia in children with neuromuscular disease and the implications for management. […] The etiology of hip pathology is influenced by factors including functional status, muscular tone, motor control, child’s age, and muscle strength. […] Understanding the risk factors leading to hip pathology can help to define principles for the management of neurologic hip impairment. […] There are many factors influencing the etiology and development of DDH; however, swaddling the baby with the hips adducted and extended for prolonged periods as a common cultural practice has been shown to be one important factor. […] The primary etiology of hip dysplasia in children with high tone is a force that is too high and directed in a posterosuperior direction.

• #37 Developmental Dysplasia of the Hip | AAFP

  https://www.aafp.org/pubs/afp/issues/2006/1015/p1310.html

  Eighty percent of children with DDH are females. This is postulated to be related to the effects of additional estrogen produced by the female fetus, which increases ligamentous laxity. […] DDH occurs more often in children who present in the breech position. It is believed that in utero knee extension of the infant in the breech position results in sustained hamstring forces around the hip and contributes to subsequent hip instability. […] In utero postural deformities and oligohydramnios also are associated with DDH. For unknown reasons, DDH is less common in black persons. […] The postnatal extrauterine environment also plays a role in DDH. The incidence of DDH is high in Native American cultures that use swaddling, which forces the hips into adduction and extension.

• #38 Hip dysplasia – Wikipedia

  https://en.wikipedia.org/wiki/Hip_dysplasia

  Hip dysplasia is considered to be a multifactorial condition. That means that several factors are involved in causing the condition to manifest. […] The cause of the condition is unknown; however, some factors of congenital hip dislocation are through heredity and racial background. […] It is also thought that the higher rates in some ethnic groups (such as some Native American groups) is due to the practice of swaddling of infants, which is known to be a potential risk factor for developing dysplasia. […] Some studies suggest a hormonal link. […] Specifically, the hormone relaxin has been indicated. […] A genetic factor is indicated since the trait runs in families and there is an increased occurrence in some ethnic populations (e.g., Native Americans, Sami people). […] Further risk factors include, gender, genetics (family history), and firstborns.

• #39 Developmental Dysplasia of the Hip (DDH): Etiology, Diagnosis, and Management

  https://pmc.ncbi.nlm.nih.gov/articles/PMC10488138/

  Developmental dysplasia of the hip (DDH) is a complex disorder that refers to different hip problems, including neonatal instability, acetabular, or femoral dysplasia, hip subluxation, and hip dislocation. […] Despite identifying the risk factors, the exact aetiology and pathophysiology are still unclear. […] The optimal growth of the hip joint depends upon two main factors: first, the concentric reduction of femoral head, and second, adequate balance of growth between acetabular and triradiate cartilages. Any imbalance in these, whether during fetal development or postnatal growth, will result in abnormal hip development. The complex nature of this condition is due to a mix of genetic, environmental, and mechanical factors. Various etiological theories of DDH have been proposed in the literature, highlighting hormonal, mechanical, and genetic factors.

• #40 Hip dysplasia – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/hip-dysplasia/symptoms-causes/syc-20350209

  Hip dysplasia is the medical term for a hip socket that doesn’t fully cover the ball portion of the upper thighbone. This allows the hip joint to become partially or completely dislocated. Most people with hip dysplasia are born with the condition. […] At birth, the hip joint is made of soft cartilage that gradually hardens into bone. The ball and socket need to fit together well because they act as molds for each other. If the ball isn’t seated firmly into the socket, the socket will not fully form around the ball and will become too shallow. […] During the final month before birth, the space within the womb can become so crowded that the ball of the hip joint moves out of its proper position. This results in a shallower socket. Factors that may reduce the amount of space in the womb include: First pregnancy, Large baby, Breech presentation. […] Hip dysplasia tends to run in families and is more common in girls. The risk of hip dysplasia is also higher in babies born in the breech position and in babies who are swaddled tightly with the hips and knees straight.

• #41 Understanding and Treating Hip Dysplasia

  https://www.wosm.com/blog/understanding-and-treating-hip-dysplasia/

  Hip dysplasia is a fairly common condition in both adolescents and adults. […] Dysplasia refers to a condition where the hip joint is abnormally formed in early development. […] Dysplastic hips are characterized by abnormally shallow sockets, as seen below. […] The result is that the area of contact between the ball and socket is decreased. This decrease in contact area results in an increase in pressure on the articular cartilage in the joint. […] Dysplasia has been called Congenital Hip Dysplasia (present from birth) and also Developmental Dysplasia of the Hip (occurring during hip development) because the abnormality is generally present to some extent at birth but can change and evolve as the hip joint grows and matures. […] The causes of pain in the dysplastic hip may include:

• #42 Understanding and Treating Hip Dysplasia

  https://www.wosm.com/blog/understanding-and-treating-hip-dysplasia/

  The increased contact pressure in the dysplastic hip can, over time, lead to progressive damage to the articular cartilage and, if left uncorrected, can eventually result in the development of hip arthritis at an early age. […] In some cases hip dysplasia, whether diagnosed and treated or not, will result in significant damage to the articular cartilage. When the articular cartilage begins to wear out, this is known as hip arthritis.

• #43

  https://www.orthobullets.com/pediatrics/4118/developmental-dysplasia-of-the-hip-ddh

  Developmental Dysplasia of the Hip encompasses a spectrum of disease that includes dysplasia, subluxation, and dislocation. […] Initial instability is thought to be caused by maternal and fetal laxity, genetic laxity, and intrauterine and postnatal malpositioning. […] The etiology of DDH includes shallow or underdeveloped acetabulum, displacement of the joint with some contact remaining between the articular surfaces, and complete displacement of the joint with no contact between the original articular surfaces. […] DDH is associated with teratologic hip, which is dislocated in utero and irreducible on neonatal exam, and presents with a pseudoacetabulum. […] The pathoanatomy of DDH indicates that initial instability leads to dysplasia, which typically presents as a deficiency in the anterior or anterolateral acetabulum. […] Chronic dislocation leads to the development of secondary barriers to reduction, including thickening of the pulvinar and ligamentum teres, as well as changes in the hip capsule and iliopsoas.

• #44

  https://www.orthobullets.com/pediatrics/4118/developmental-dysplasia-of-the-hip-ddh

  Developmental Dysplasia of the Hip encompasses a spectrum of disease that includes dysplasia, subluxation, and dislocation. […] Initial instability is thought to be caused by maternal and fetal laxity, genetic laxity, and intrauterine and postnatal malpositioning. […] The etiology of DDH includes shallow or underdeveloped acetabulum, displacement of the joint with some contact remaining between the articular surfaces, and complete displacement of the joint with no contact between the original articular surfaces. […] DDH is associated with teratologic hip, which is dislocated in utero and irreducible on neonatal exam, and presents with a pseudoacetabulum. […] The pathoanatomy of DDH indicates that initial instability leads to dysplasia, which typically presents as a deficiency in the anterior or anterolateral acetabulum. […] Chronic dislocation leads to the development of secondary barriers to reduction, including thickening of the pulvinar and ligamentum teres, as well as changes in the hip capsule and iliopsoas.

• #45 The Etiology of Neuromuscular Hip Dysplasia and Implications for Management: A Narrative Review

  https://www.mdpi.com/2227-9067/11/7/844

  This study summarizes the current knowledge of the etiology of hip dysplasia in children with neuromuscular disease and the implications for management. […] The etiology of hip pathology is influenced by factors including functional status, muscular tone, motor control, child’s age, and muscle strength. […] Understanding the risk factors leading to hip pathology can help to define principles for the management of neurologic hip impairment. […] There are many factors influencing the etiology and development of DDH; however, swaddling the baby with the hips adducted and extended for prolonged periods as a common cultural practice has been shown to be one important factor. […] The primary etiology of hip dysplasia in children with high tone is a force that is too high and directed in a posterosuperior direction.

• #46 The Etiology of Neuromuscular Hip Dysplasia and Implications for Management: A Narrative Review

  https://www.mdpi.com/2227-9067/11/7/844

  The risk factors for producing this abnormal force environment include motor control, age, muscle tone and force, gross motor function, and predominant thigh posture. […] Normal force environment from normal physical activity during childhood growth is required for normal femoral shape and hip development. […] Children with spasticity develop coxa valga mainly due to a high and vertical hip joint reaction force, which may lead to acetabular dysplasia and hip dislocation.

• #47 Dysplasia: Hip Condition | Causes | Inside the Hip | Paris

  https://www.chirurgiedelahanche.com/en/pathologies/dysplasia/

  The cause of this condition is a malformation of the pelvis at the hip joint, leading to instability of the femoral head within the pelvis. The coverage of the femurs head by the pelvis is insufficient and/or poorly oriented, resulting in excessive mobility of the femoral head in its pelvic socket. This condition forces the hip muscles to contract abnormally, causing pain. The inadequate coverage of the femurs head leads to damage to the hips cartilage and labrum (hip joint), and can lead to premature osteoarthritis (wear and tear) of the hip.

• #48 Hip Dysplasia: Causes, signs, symptoms and treatment – Times of India

  https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/hip-dysplasia-causes-signs-symptoms-and-treatment/articleshow/109600518.cms

  Hip dysplasia occurs when the femur does not properly align with the socket in the pelvis. This misalignment can result from a shallow hip socket or an irregularly shaped femur head. It can be hereditary, present by birth. […] The abnormal formation of the hip joint can lead to excessive wear and tear on the cartilage, eventually leading to osteoarthritis. The instability can put excess strain on the bones, making one prone to fractures.

• #49 Hip Dysplasia — Hip & Knee Book

  https://hipandkneebook.com/causes-hip-oa/2017/3/26/hip-dysplasia

  The two most commonly described types of Structural Pathology are Hip Dysplasia and Femoroacetabular Impingement. They share the same foundation of abnormal hip architecture, yet they are fully distinct conditions. […] Uncorrected hip dysplasia is the most common etiology of hip OA in young patients requiring THA, with underlying dysplasia in 50% of patients under 50 yo. […] Increased acetabular obliquity leads to anterior-lateral undercoverage of the femoral head. A smaller surface area of contact between the femoral head and acetabulum increases peak forces on the cartilage and promotes subtle hip instability that increases shear stresses on the cartilage and promotes fatigue failure of the labrum. Chronic mechanical overload may lead to osteoarthritis. […] The amount of acetabular deficiency is characterized by the Lateral Center-Edge Angle and the Acetabular Inclination. A dysplastic hip with a lateral center-edge angle 16, a center-edge angle 25, and an acetabular index 15 is associated with high risk for early arthritis if treated without surgery. […] The severity of dysplasia can be described by the Crowe Classification, which reports worsening hip subluxation due to the dysplasia. A Crowe 4 is complete hip dislocation, which can cause a pseudoacetabulum above the normal hip center.

• #50 10 Telltale Signs and Symptoms of Hip Dysplasia: Kwan (Kevin) Jun Park, MD: Orthopaedic Surgeon

  https://www.kevinparkmd.com/blog/10-telltale-signs-and-symptoms-of-hip-dysplasia

  Did you know the most common cause of hip osteoarthritis in younger (under 50) people is a condition called hip dysplasia? […] While most people have congenital hip dysplasia, meaning they are born with the condition, you might not develop symptoms until you get older. […] The condition also increases your risk of osteoarthritis, because the joints cushioning wears away faster than in joints with a normal shape. […] Hip dysplasia triggers several painful and/or uncomfortable signs and symptoms. […] Other musculoskeletal conditions can cause similar symptoms. […] The right treatment for your hip dysplasia depends on your age and the severity of your condition. […] But most patients with hip dysplasia benefit from hip dysplasia surgery to address the underlying joint issue.

• #51

  https://www.workssowell.com/a/blog/what-are-the-causes-of-canine-hip-dysplasia?srsltid=AfmBOor6Y9Z9RzukHYO3j9p-qmxKvkrfgHJ6VED83SyCWKYvSE6Fq-qa

  Hip dysplasia is a progressive condition in dogs that stems from laxity, or looseness, in the hip joint. […] There are many causes of canine hip dysplasia, including genetics, weight, and lifestyle factors. […] Excess weight and obesity can cause or exacerbate hip dysplasia in dogs. […] Also, feed your large-breed puppy food formulated for large-breed puppies. This will prevent rapid growth, which can lead to hip dysplasia. […] Ask your vet whether a radiographic evaluation (such as PennHIP) is appropriate for your dog. This will not prevent hip dysplasia, but it can let you know if your dog is prone to the condition and allow you to make choices concerning lifestyle changes and treatments that might be necessary in the future.

• #52 Hip Dysplasia Symptoms and Treatment | Froedtert & MCW

  https://www.froedtert.com/orthopaedics/hip-preservation/hip-dysplasia

  Hip dysplasia is a condition in which there is either a shallow or deficient hip socket. Some people are born with hip dysplasia (congenital) or they can develop it as they grow (developmental). […] Hip dysplasia is the most common cause of hip arthritis in patients under 50 years old. It occurs more frequently in women than in men. […] The surgical treatment of hip dysplasia is a surgery called periacetabular osteotomy (PAO). PAO changes the position of the acetabulum (socket). […] Hip dysplasia in adults that is not treated may worsen and eventually progress to hip arthritis.

• #53 Hip Dysplasia | Boston Children’s Hospital

  https://www.childrenshospital.org/conditions/hip-dysplasia

  Hip dysplasia occurs when the hip joint has not developed properly and the socket (acetabulum) is too shallow. […] The exact cause is unknown, but doctors believe several factors increase a child’s risk of hip dysplasia: a family history of DDH in a parent or other close relative, gender (girls are two to four times more likely to have the condition), first-born babies, breech position during pregnancy, and tight swaddling with legs extended. […] Some teens and young adults are born with mild DDH that becomes symptomatic as they grow. However, the hip joint continues to develop throughout the teen years and sometimes does not develop properly, even if you were not born with DDH. […] Girls and women are two to four times more likely than boys to have hip dysplasia. It also tends to affect first-born children and those who have a close family member with hip problems. […] Hip dysplasia is sometimes confused with hip impingement, which occurs when extra bone grow on the acetabulum or femoral head.

• #54 Hip Dysplasia – Symptoms and Causes | GetWellGo

  https://getwellgo.com/post/hip-dysplasia-symptoms-and-causes

  The causes of hip dysplasia in adults are as follows: Health consequences of untreated developmental dysplasia in childhood: It is possible to have mild developmental dysplasia in childhood and never realize that you have it until you start feeling pain or experiencing some other problems in adulthood. […] Acquired hip dysplasia: This occurs where an injury takes place, or constant stressing of the hip joint alters the constitution of the joint and instability arises. […] There are certain hereditary factors which become influential in causing the problem of hip dysplasia in adults.

• #55 Hip Dysplasia – Symptoms and Causes | GetWellGo

  https://getwellgo.com/post/hip-dysplasia-symptoms-and-causes

  Repeated stress or trauma, such as the one experienced by athletes or those people who perform high impact activities regularly can also be a cause of acquired hip dysplasia particularly in the adulthood. […] Hip dysplasia is common in females than males; this may be cause by differences in structure of the pelvic region. […] Firstborn children are also more vulnerable; this could be attributed to the following reasons; that the pelvic space of the mother is narrow during childbirth. […] Hip dysplasia is also common among babies with low birth weight or those born preterm. […] Some diseases, for example, Ehlers-Danlos syndrome or Down syndrome that involve connective tissues pose the chances of joint instability including the hip dysplasia. […] Some of the conditions that are associated with hip dysplasia include cerebral palsy, spina bifida or any other diseases that affect muscles as well as bone growth.

• #56 Hip Dysplasia – Symptoms and Causes | GetWellGo

  https://getwellgo.com/post/hip-dysplasia-symptoms-and-causes

  The causes of hip dysplasia in adults are as follows: Health consequences of untreated developmental dysplasia in childhood: It is possible to have mild developmental dysplasia in childhood and never realize that you have it until you start feeling pain or experiencing some other problems in adulthood. […] Acquired hip dysplasia: This occurs where an injury takes place, or constant stressing of the hip joint alters the constitution of the joint and instability arises. […] There are certain hereditary factors which become influential in causing the problem of hip dysplasia in adults.

• #57 Hip Dysplasia – Symptoms and Causes | GetWellGo

  https://getwellgo.com/post/hip-dysplasia-symptoms-and-causes

  The causes of hip dysplasia in adults are as follows: Health consequences of untreated developmental dysplasia in childhood: It is possible to have mild developmental dysplasia in childhood and never realize that you have it until you start feeling pain or experiencing some other problems in adulthood. […] Acquired hip dysplasia: This occurs where an injury takes place, or constant stressing of the hip joint alters the constitution of the joint and instability arises. […] There are certain hereditary factors which become influential in causing the problem of hip dysplasia in adults.

• #58 Acetabular Dysplasia | Joint Care | Orthopedics | Henry Ford Health – Detroit, MI

  https://www.henryford.com/services/orthopedics/joint-care/treatments/hip-conditions/acetabular-dysplasia

  Hip dysplasia is a problem with the way the hip joint is shaped or aligned. […] Many people are born with this condition. More rarely, a traumatic injury to the hip socket during childhood can cause the condition. A rare condition called Legg-Calv-Perthes disease, which occurs when the femoral head doesn’t get enough blood, can also cause hip dysplasia.

• #59 Hip Dysplasia | Boston Children’s Hospital

  https://www.childrenshospital.org/conditions/hip-dysplasia

  Hip dysplasia occurs when the hip joint has not developed properly and the socket (acetabulum) is too shallow. […] The exact cause is unknown, but doctors believe several factors increase a child’s risk of hip dysplasia: a family history of DDH in a parent or other close relative, gender (girls are two to four times more likely to have the condition), first-born babies, breech position during pregnancy, and tight swaddling with legs extended. […] Some teens and young adults are born with mild DDH that becomes symptomatic as they grow. However, the hip joint continues to develop throughout the teen years and sometimes does not develop properly, even if you were not born with DDH. […] Girls and women are two to four times more likely than boys to have hip dysplasia. It also tends to affect first-born children and those who have a close family member with hip problems. […] Hip dysplasia is sometimes confused with hip impingement, which occurs when extra bone grow on the acetabulum or femoral head.

• #60 Pediatric and young-adult hip dysplasia: Types, causes and treatment options | My Vanderbilt Health

  https://my.vanderbilthealth.com/pediatric-and-young-adult-hip-dysplasia-types-causes-and-treatment-options/

  Hip dysplasia can occur because the hip didnt form correctly in the womb, but it may also crop up during adolescence if hip dysplasia went undiagnosed in infancy or if a healthy hip doesnt develop properly during bone growth, Schoenecker explained. […] Sometimes hip dysplasia goes unnoticed until stress on the hip increases through athletics, a minor accident or pregnancy.

• #61

  https://www.advocatehealth.com/health-services/orthopedic-center/specialties/hip/hip-dysplasia

  Hip dysplasia can develop at any time in your life. Most commonly, its a congenital condition, meaning it develops at birth. […] Hip dysplasia is influenced by several factors, including genetics and your environment. Some common causes may include: […] Family history: If you have a family member with hip dysplasia, your chances of developing it are higher. […] Position in the womb: Breech babies, or those positioned with their feet down in the womb, are at higher risk. […] Swaddling practices: Swaddling babies tightly with their legs straight can increase the risk, as it restricts normal hip movement. […] Women, or those assigned female at birth, are more likely to have hip dysplasia than men. Hormonal differences between males and females play a significant role in the likelihood of developing hip dysplasia. […] During pregnancy, the hormone relaxin is produced to loosen the ligaments in the pelvis to help with childbirth. This hormone can also affect infants, making their hip joints more susceptible to instability and dysplasia.

• #62

  https://www.advocatehealth.com/health-services/orthopedic-center/specialties/hip/hip-dysplasia

  Hip dysplasia can develop at any time in your life. Most commonly, its a congenital condition, meaning it develops at birth. […] Hip dysplasia is influenced by several factors, including genetics and your environment. Some common causes may include: […] Family history: If you have a family member with hip dysplasia, your chances of developing it are higher. […] Position in the womb: Breech babies, or those positioned with their feet down in the womb, are at higher risk. […] Swaddling practices: Swaddling babies tightly with their legs straight can increase the risk, as it restricts normal hip movement. […] Women, or those assigned female at birth, are more likely to have hip dysplasia than men. Hormonal differences between males and females play a significant role in the likelihood of developing hip dysplasia. […] During pregnancy, the hormone relaxin is produced to loosen the ligaments in the pelvis to help with childbirth. This hormone can also affect infants, making their hip joints more susceptible to instability and dysplasia.

• #63 Developmental Dysplasia of the Hip (DDH): Etiology, Diagnosis, and Management

  https://pmc.ncbi.nlm.nih.gov/articles/PMC10488138/

  Developmental dysplasia of the hip (DDH) is a complex disorder that refers to different hip problems, including neonatal instability, acetabular, or femoral dysplasia, hip subluxation, and hip dislocation. […] Despite identifying the risk factors, the exact aetiology and pathophysiology are still unclear. […] The optimal growth of the hip joint depends upon two main factors: first, the concentric reduction of femoral head, and second, adequate balance of growth between acetabular and triradiate cartilages. Any imbalance in these, whether during fetal development or postnatal growth, will result in abnormal hip development. The complex nature of this condition is due to a mix of genetic, environmental, and mechanical factors. Various etiological theories of DDH have been proposed in the literature, highlighting hormonal, mechanical, and genetic factors.

• #64 Developmental dysplasia of the hip (DDH) | Children’s Hospital of Philadelphia

  https://www.chop.edu/conditions-diseases/developmental-dysplasia-hip-ddh

  Developmental dysplasia of the hip (DDH or hip dysplasia) is a relatively common condition in the developing hip joint. It occurs once in every 1,000 live births. […] The exact cause(s) of hip dysplasia are unknown, but it is likely that many factors both environmental and genetic play a role. […] One of the environmental influences thought to contribute to hip dysplasia is the baby’s response to the mother’s hormones during pregnancy. A tight uterus that prevents fetal movement or breech position may also cause hip dysplasia. […] Another environmental factor is infant positioning in the first year of life.

• #65 Hip Dysplasia | Boston Children’s Hospital

  https://www.childrenshospital.org/conditions/hip-dysplasia

  Hip dysplasia occurs when the hip joint has not developed properly and the socket (acetabulum) is too shallow. […] The exact cause is unknown, but doctors believe several factors increase a child’s risk of hip dysplasia: a family history of DDH in a parent or other close relative, gender (girls are two to four times more likely to have the condition), first-born babies, breech position during pregnancy, and tight swaddling with legs extended. […] Some teens and young adults are born with mild DDH that becomes symptomatic as they grow. However, the hip joint continues to develop throughout the teen years and sometimes does not develop properly, even if you were not born with DDH. […] Girls and women are two to four times more likely than boys to have hip dysplasia. It also tends to affect first-born children and those who have a close family member with hip problems. […] Hip dysplasia is sometimes confused with hip impingement, which occurs when extra bone grow on the acetabulum or femoral head.

• #66 Developmental Dysplasia of the Hip – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK563157/

  Developmental dysplasia of the hip occurs due to an abnormal hip development, presenting in infancy or early childhood with a spectrum ranging from dysplasia to dislocation of the hip joint. […] The exact etiology is still elusive. Multifactorial in nature, a combination of genetic, environmental, and mechanical factors play a role. Many genetic loci have also been identified in familial cases. […] The following risk factors for developmental dysplasia of the hip have demonstrated an increased incidence of hip abnormalities, which should prompt clinicians to perform clinical screening, including: […] Female sex: There is a fourfold greater incidence in females than males. The increased incidence is likely due to ligamentous laxity from maternal hormones. […] Breech position: In the last trimester, breech position is the most significant risk factor for developmental dysplasia of the hip, with an odds ratio of 5.47.

• #67 What Causes Hip Dysplasia? – International Hip Dysplasia Institute

  https://hipdysplasia.org/developmental-dysplasia-of-the-hip/causes-of-ddh/

  The exact cause or causes of hip dysplasia are not known. It is widely accepted that hip dysplasia develops around the time of birth because the hip socket is shallower at birth than at any time before or after birth. […] Hip dysplasia is approximately 12 times more likely when there is a family history. […] Genetics plays a role but is not a direct cause of hip dysplasia. […] The babys womb position can increase pressure on the hips. […] Babies in the breech position are more likely to have instability than babies in a normal womb position and have an increased risk of DDH. […] Babies with fixed foot deformity or stiffness in the neck (torticollis) have slightly increased risk of hip dysplasia. […] Some infants may be more sensitive to these hormones than others, allowing for excessive ligament laxity in the baby.

• #68 Developmental Dysplasia of the Hip | AAFP

  https://www.aafp.org/pubs/afp/issues/2006/1015/p1310.html

  Developmental dysplasia of the hip refers to a continuum of abnormalities in the immature hip that can range from subtle dysplasia to dislocation. […] The incidence of DDH is variable and depends on many factors. Approximately one in 1,000 children is born with a dislocated hip, and 10 in 1,000 may have hip subluxation. Factors contributing to DDH include breech presentation, female sex, positive family history, firstborn status, and oligohydramnios. Intrauterine position, sex, race, and positive family history are the most important risk factors. […] A family history positive for DDH may be found in 12 to 33 percent of affected patients. The risk of DDH for a child has been documented at 6 percent when there is one affected sibling, 12 percent with one affected parent, and 36 percent if a parent and a sibling are affected.

• #69 Developmental Dysplasia of the Hip (DDH): Etiology, Diagnosis, and Management

  https://pmc.ncbi.nlm.nih.gov/articles/PMC10488138/

  The hormonal theory has a significant role in hip dysplasia development. It is based on an imbalanced ratio of estrogen to progesterone. A progesterone-rich environment can promote dislocation, whereas an estrogen-rich environment can inhibit it. […] The mechanical factors are usually related to restricted space in utero resulting in fetal packaging deformities. This could be seen in the first baby. The baby may be growing inside a horn of a bicornuate uterus where there is limited space. If the baby is relatively large, there may be a subsequent packaging deformity. […] One of the most important mechanical factors that may be a risk for DDH is breech presentation at birth. A 25% risk of DDH exists for neonates born after being in the breech position. About 30 to 50% of patients with DDH have a history of breech delivery.

• #70 Treatment for Developmental Dysplasia of the Hip or DDH | HSS

  https://www.hss.edu/conditions_developmental-dysplasia-of-the-hip-ddh.asp

  Hip dysplasia may develop in a baby around the time of birth or during early childhood. […] Genetics plays a strong role, but other influences during pregnancy and birth such as congenital conditions caused by the fetus being in a uterus that is too small and cases of breech birth can also lead to developmental hip dysplasia. […] A breech-birth child is 10 times more likely to develop hip dysplasia than a child born headfirst.

• #71 Hip dysplasia – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/hip-dysplasia/symptoms-causes/syc-20350209

  Hip dysplasia is the medical term for a hip socket that doesn’t fully cover the ball portion of the upper thighbone. This allows the hip joint to become partially or completely dislocated. Most people with hip dysplasia are born with the condition. […] At birth, the hip joint is made of soft cartilage that gradually hardens into bone. The ball and socket need to fit together well because they act as molds for each other. If the ball isn’t seated firmly into the socket, the socket will not fully form around the ball and will become too shallow. […] During the final month before birth, the space within the womb can become so crowded that the ball of the hip joint moves out of its proper position. This results in a shallower socket. Factors that may reduce the amount of space in the womb include: First pregnancy, Large baby, Breech presentation. […] Hip dysplasia tends to run in families and is more common in girls. The risk of hip dysplasia is also higher in babies born in the breech position and in babies who are swaddled tightly with the hips and knees straight.

• #72 Hip Dysplasia – Causes, Symptoms & Treatment

  https://www.discmdgroup.com/orthopedic-hip-conditions/hip-dysplasia/

  Hip dysplasia occurs when the hip socket (acetabulum) is too shallow or incorrectly shaped, which prevents the proper coverage of the femoral head (the ball part of the hip joint). […] Family history of hip dysplasia: The condition often runs in families. […] Breech position: Babies born in a breech position (feet first) have a higher risk of hip dysplasia. […] Certain ethnic backgrounds: Some populations, such as Native Americans, have a higher incidence of hip dysplasia. […] First-born status: First-born children are more prone to hip dysplasia due to their position in the uterus. […] Large birth weight: Larger babies face more pressure in the womb, increasing the risk of hip dysplasia. […] Tight swaddling practices: Wrapping infants too tightly can prevent proper hip movement, which affects their development.

• #73 Hip dysplasia – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/hip-dysplasia/symptoms-causes/syc-20350209

  Hip dysplasia is the medical term for a hip socket that doesn’t fully cover the ball portion of the upper thighbone. This allows the hip joint to become partially or completely dislocated. Most people with hip dysplasia are born with the condition. […] At birth, the hip joint is made of soft cartilage that gradually hardens into bone. The ball and socket need to fit together well because they act as molds for each other. If the ball isn’t seated firmly into the socket, the socket will not fully form around the ball and will become too shallow. […] During the final month before birth, the space within the womb can become so crowded that the ball of the hip joint moves out of its proper position. This results in a shallower socket. Factors that may reduce the amount of space in the womb include: First pregnancy, Large baby, Breech presentation. […] Hip dysplasia tends to run in families and is more common in girls. The risk of hip dysplasia is also higher in babies born in the breech position and in babies who are swaddled tightly with the hips and knees straight.

• #74 Hip Dysplasia – Causes, Symptoms & Treatment

  https://www.discmdgroup.com/orthopedic-hip-conditions/hip-dysplasia/

  Hip dysplasia occurs when the hip socket (acetabulum) is too shallow or incorrectly shaped, which prevents the proper coverage of the femoral head (the ball part of the hip joint). […] Family history of hip dysplasia: The condition often runs in families. […] Breech position: Babies born in a breech position (feet first) have a higher risk of hip dysplasia. […] Certain ethnic backgrounds: Some populations, such as Native Americans, have a higher incidence of hip dysplasia. […] First-born status: First-born children are more prone to hip dysplasia due to their position in the uterus. […] Large birth weight: Larger babies face more pressure in the womb, increasing the risk of hip dysplasia. […] Tight swaddling practices: Wrapping infants too tightly can prevent proper hip movement, which affects their development.

• #75 Hip Dysplasia: What is it and how is it treated?

  https://www.webmd.com/children/what-is-hip-dysplasia

  Hip dysplasia can run in families and it happens more often in girls than boys. It shows up in babies because the hip joint is made of soft cartilage when youre born. Over time, it hardens into bone. […] The ball and socket help mold each other during this time, so if the ball isnt fitting properly into the socket, the socket may end up too shallow and not form completely over the ball. […] There are a few reasons this can happen right before a baby is born: Its the mothers first pregnancy. The baby is large. Or there is oligohydramnios, a condition in which there is too little amniotic fluid in the sac that the baby has lived in throughout the pregnancy, which limits the baby’s movement. The baby is in the breech position — meaning the rear, not the head, is toward the birth canal. […] All of these things can reduce the amount of space in the womb, which can make things crowded for the baby and move the ball out of its proper position. Swaddling babies with their hips and knees straight can also contribute to the condition.

• #76 Developmental dysplasia of the hip: MedlinePlus Medical EncyclopediaLock

  https://medlineplus.gov/ency/article/000971.htm

  Developmental dysplasia of the hip (DDH) is a dislocation of the hip joint that is present at birth. The cause is unknown. Low levels of amniotic fluid in the womb during pregnancy can increase a baby’s risk for DDH. Other risk factors include: Being the first child, Being female, Breech position during pregnancy, in which the baby’s bottom is down, Family history of the disorder, Large birth weight. […] DDH occurs in about 1 to 1.5 of 1,000 births.

• #77 Developmental Dysplasia of the Hip – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK563157/

  Family history: Many genes have been implicated in causing developmental dysplasia of the hip in the Asian population, including COL2A1, DKK1, HOXB9, HOXD9, and WISP3. […] Swaddling: Swaddling infants in the adducted and extended position may increase the incidence of developmental dysplasia of the hip in specific populations, including Native American, Japanese, and Turkish infants. […] In utero restriction: Any physical limitation within the uterus can contribute to developmental dysplasia of the hip. […] Postterm gestation: Postmaturity is a risk factor for developmental dysplasia of the hip.

• #78 Hip dysplasia – Wikipedia

  https://en.wikipedia.org/wiki/Hip_dysplasia

  In the breech position the femoral head tends to get pushed out of the socket and the breech position is probably the most important single risk factor, whether an infant is delivered vaginally or by cesarean section. […] As an acquired condition it has been linked to traditions of swaddling infants, use of overly restrictive baby seats, carriers and other methods of transporting babies, or use of a cradle board which locks the hip joint in an „adducted” position (pulling the knees together tends to pull the heads of the femur bone out of the sockets or acetabulae) for extended periods.

• #79 Congenital Hip Dislocation: Causes, Symptoms, and Diagnosis

  https://www.healthline.com/health/developmental-dysplasia-of-the-hip

  Congenital hip dislocation (CHD) occurs when a child is born with an unstable hip. Its caused by abnormal formation of the hip joint during their early stages of fetal development. […] The cause of CHD is unknown in many cases. Contributing factors include low levels of amniotic fluid in the womb, breech presentation, which occurs when your baby is born hips first, and a family history of the condition. Confinement in the uterus may also cause CHD or contribute to it. […] You cant prevent CHD. Its important to bring your child to regular checkups so their doctor can identify and treat the condition as soon as possible. […] Complicated or invasive treatment is less likely to be necessary when your doctor identifies CHD early and your baby received treatment with a Pavlik harness. Its estimated that between 80 and 95 percent of cases identified early receive successful treatment, depending on the severity of the condition.

• #80 What is Hip Dysplasia? Facts You Need to Know

  https://www.summithealth.com/health-wellness/what-hip-dysplasia-facts-you-need-know

  In mild cases, hip dysplasia in infants can improve with time and proper bracing. However, without treatment, it may lead to arthritis and other complications in adulthood. […] Hip dysplasia can be painful, especially if it leads to arthritis or joint instability. Early treatment can help alleviate pain and improve joint function.

• #81 Developmental Dysplasia of the Hip (DDH): Etiology, Diagnosis, and Management

  https://pmc.ncbi.nlm.nih.gov/articles/PMC10488138/

  Developmental dysplasia of the hip (DDH) is a complex disorder that refers to different hip problems, including neonatal instability, acetabular, or femoral dysplasia, hip subluxation, and hip dislocation. […] Despite identifying the risk factors, the exact aetiology and pathophysiology are still unclear. […] The optimal growth of the hip joint depends upon two main factors: first, the concentric reduction of femoral head, and second, adequate balance of growth between acetabular and triradiate cartilages. Any imbalance in these, whether during fetal development or postnatal growth, will result in abnormal hip development. The complex nature of this condition is due to a mix of genetic, environmental, and mechanical factors. Various etiological theories of DDH have been proposed in the literature, highlighting hormonal, mechanical, and genetic factors.

• #82 Developmental dysplasia of the hip (DDH) | Children’s Hospital of Philadelphia

  https://www.chop.edu/conditions-diseases/developmental-dysplasia-hip-ddh

  Developmental dysplasia of the hip (DDH or hip dysplasia) is a relatively common condition in the developing hip joint. It occurs once in every 1,000 live births. […] The exact cause(s) of hip dysplasia are unknown, but it is likely that many factors both environmental and genetic play a role. […] One of the environmental influences thought to contribute to hip dysplasia is the baby’s response to the mother’s hormones during pregnancy. A tight uterus that prevents fetal movement or breech position may also cause hip dysplasia. […] Another environmental factor is infant positioning in the first year of life.

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